Hey everyone; Don't know if you are aware or not, but Amazon has a leather case for Evo and some others that will work with the 3500 extended battery. They call it a "leather wing case". Also, Seidio says they have holster cases that work with their 3500 extended battery. I "live chatted" with someone from Seidio today, and they said that their new leather horizontal case which works with the Innocase II will not work with the extended battery. So..Amazon, here I come.